1: With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-20 - 0°C; 0.0833333 h; 2: 2,4-difluoro-1-bromobenzene in tetrahydrofuran; hexane T=-78 - -65°C; 2 h; 3: With 1,1,1,3,3,3-hexachloro-propan-2-one in tetrahydrofuran; hexane T=-65 - 20°C;

n-butyllithium; diisopropylamine in tetrahydrofuran; hexane

1: n-butyllithium; diisopropylamine in tetrahydrofuran T=-20 - 0°C; 0.0833333 h; 2: T=-78°C; 3: 2,4-difluoro-1-bromobenzene With 1,1,1,3,3,3-hexachloro-propan-2-one more than 3 stages;

1: 3-Chloro-2,4-difluoro-bromobenzene in diethyl ether Cooling with acetone-dry ice; 2: n-butyllithium in hexane T=-65°C; 0.75 h; 3: carbon dioxide T=-65 - 20°C;

1: 3-Chloro-2,4-difluoro-bromobenzene With n-butyllithium in diethyl ether T=-78 - -70°C; 0.25 h; 2: carbon dioxide T=-70°C;

hydrogenchloride; n-butyllithium; CO2 in water

hydrogenchloride; n-butyllithium in water